Filename (with optional path w/o leading '/') of firmare file which should be uploaded to ftp server. Any successful SET operation on sysMgmtFrmwUlPath starts next management action of uploading firmware file to ftp server. Filename will be auto-prepended with 'SN-nnnn.' string to distinct uploaded files from other devices, e.g. if provided filename and path are 'uploads/fmw', then SN-nnnn.fmw file will be created in 'uploads' folder at ftp server, where nnnn is value of sysSerialNumber. Optionally, operative ftp account in the same format as described for sysMgmtAccess can be supplied to overwrite default ftp account for current operation only. If so, such account string, followed by single whitespace, should be prepended to optional path and required filename. SET operation will return inconsistentValue error if sysMgmtCurrentState is not 'idle'. SET operation will return wrongLength error if new value is empty. SET operation will return wrongValue error if any of the following is true: - sysMgmtAccess is empty and no ftp account is present in the string, - used ftp account (either sysMgmtAccess or specified in the string) has invalid format, - full path to file has illegal chars or double slashes. Otherwise SET operation is successful, but ftp connection can fail later if either used ftp account is invalid or provided filepath and|or filename are inconsistent with ftp-server file locations or permissions. The value of sysMgmtFrmwUlPath is kept unchanged till next invocation of firmware uploading action.